Search port on switches by SNMP FDB table

find_port.sh

#!/usr/bin/env bash

COMMUNITY='public'
FDB_OID='.1.3.6.1.2.1.17.7.1.2.2.1.2'
TIMEOUT=5
RETRIES=3

if [ "$#" -ne 2 ]; then
    echo "Usage: $0 <MAC> <IP>"
    exit 1
fi

# The main code
IFS=':-' read -r -a arr <<< "$1"
mac=$( printf '%d.%d.%d.%d.%d.%d' $((0x${arr[0]})) $((0x${arr[1]})) $((0x${arr[2]})) $((0x${arr[3]})) $((0x${arr[4]})) $((0x${arr[5]})) )

ip=$2
echo "MAC: ${mac}" >&2
echo "IP: ${ip}" >&2

res=$({ snmpbulkwalk -v2c -c ${COMMUNITY} -t ${TIMEOUT} -r ${RETRIES} ${ip} ${FDB_OID} | grep ${mac}; } 2>&1 ) 

case ${res} in
  *INTEGER*)
    portnum=$(echo ${res} | sed 's/.*: //')
    echo "{\"portnum\": ${portnum}}" >&1

    exit 1
    ;;
  *) 
    res=${res:="Not found"}
    echo "{\"msg\": \"${res}\"}" >&1
    exit 0
    ;;
esac

find_port_hosts.sh

#!/usr/bin/env bash

COMMUNITY='public'
FDB_OID='.1.3.6.1.2.1.17.7.1.2.2.1.2'
TIMEOUT=5
RETRIES=3

# Parse commandline parameters
if [ "$#" -lt 2 ]; then
    echo "Usage: $0 <MAC> <host1> <host2> ... <hostN>"
    exit 1
else
    hosts=( "$@" )
fi

# echo ${hosts[@]}

IFS=':-' read -r -a arr <<< "${hosts[0]}"
mac=$( printf '%d.%d.%d.%d.%d.%d' $((0x${arr[0]})) $((0x${arr[1]})) $((0x${arr[2]})) $((0x${arr[3]})) $((0x${arr[4]})) $((0x${arr[5]})) )
unset hosts[0]

echo "MAC: ${mac}" >&2
echo "Hosts: ${hosts[@]}" >&2


# Make pipe
PIPE=$(mktemp -u)
mkfifo ${PIPE}
# attach it to file descriptor 3
exec {FD}<>${PIPE}

# Function to perform search
function search_mac {
    # echo "Searching $1 on $2" >&2
    
    res=$({ snmpbulkwalk -v2c -c ${COMMUNITY} -t ${TIMEOUT} -r ${RETRIES} ${2} ${FDB_OID} | grep ${1}; } 2>&1 )

    case ${res} in
      *INTEGER*)
        portnum=$(echo ${res} | sed 's/.*: //')
        echo "{\"host\":\"$2\", \"portnum\": ${portnum}}" >&${FD}

        exit 0
        ;;
      *) 
        res=${res:="Not found"}
        echo "{\"host\":\"$2\", \"msg\": \"${res}\"}" >&${FD}
        exit 1
        ;;
    esac
}

# Array to hold background process IDs
PIDS=()

# Execute tasks in separate threads
for host in "${hosts[@]}"; do
    search_mac $mac $host &
    PIDS+=($!)
done

# Wait for all threads to finish
for pid in "${PIDS[@]}"; do
    wait $pid
done

# echo "All threads completed." >&2

echo -n "["
sep=''
while read -t 0.1 -u ${FD} line
do
# do something with ${LINE}
    echo -n ${sep}${line}
    sep=', '
done
echo -n ']'

# unlink the named pipe
# exec ${FD}>&-
# echo ${PIPE}
rm ${PIPE}